California Assembly Advances Statewide Upzoning Bill

California's Senate Bill 9 would allow up to four housing units on lots traditionally zoned for single-family homes, paving the way for more 'gentle density.'

2 minute read

August 27, 2021, 8:00 AM PDT

By Diana Ionescu @aworkoffiction


California

NAPA / Shutterstock

Despite a deepening housing shortage and homelessness crisis, writes Conor Dougherty, California's "State Legislature has struggled to follow their prescription to increase urban density, often because lawmakers fear angering suburban voters, whose preferences for single-family home living have been regarded as politically sacrosanct." This week, the legislature advanced a bill "that would allow two-unit buildings on lots that for generations have been reserved exclusively for single-family homes." 

The proposed upzoning, Senate Bill 9, "was furiously opposed by homeowners and local government groups who said it 'crushes single-family zoning' and would be 'the beginning of the end of homeownership in California.'" Toni Atkins, the bill’s author and president pro tem of the California Senate, called it "a gentle density increase that respects the character of neighborhoods" and "will give opportunities to people who haven’t been able to own a home." The bill, which passed the State Senate in May, "made it through the Assembly by a vote of 45-19" and will now go back to the Senate for a concurrence vote. 

Reducing or eliminating single-family zoning has been a hot topic in recent years as cities and states struggle to create more affordable housing and keep up with rising demand. "So far only Oregon has passed a state-level ban on single-family house zoning. If California’s S.B. 9 gets final passage and is signed, it would add a state of 40 million to the list." 

A second bill passed by the California Assembly this week, SB 10, "would allow local governments to rezone parcels up to 10 units with no environmental review, which would speed development by shrinking the rezoning process by several years." Proponents of statewide zoning reform argue that because "U.S. metropolitan areas operate as a contiguous economy, while their housing markets are fractured by dozens of cities and suburbs that each have their own regulations," more comprehensive state-level policies are crucial to solving the housing affordability crisis.

Thursday, August 26, 2021 in The New York Times

portrait of professional woman

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching. Mary G., Urban Planner

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching.

Mary G., Urban Planner

Use Code 25for25 at checkout for 25% off an annual plan!

Logo for Planetizen Federal Action Tracker with black and white image of U.S. Capitol with water ripple overlay.

Planetizen Federal Action Tracker

A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.

May 7, 2025 - Diana Ionescu

Person in yellow safety suit and white helmet kneels to examine water samples outdoors on a lake shore.

USGS Water Science Centers Targeted for Closure

If their work is suspended, states could lose a valuable resource for monitoring, understanding, and managing water resources.

May 1, 2025 - Inside Climate News

Wide suburban road with landscaped median and light pole banners advertising local amphitheater.

End Human Sacrifices to the Demanding Gods of Automobile Dependency and Sprawl

The U.S. has much higher traffic fatality rates than peer countries due to automobile dependency and sprawl. Better planning can reduce these human sacrifices.

April 29, 2025 - Todd Litman

Close-up of pug dog sitting on woman's lap on city bus.

Seattle Transit Asked to Clarify Pet Policy

A major dog park near a new light rail stop is prompting calls to update and clarify rules for bringing pets on Seattle-area transit systems.

May 9 - The Urbanist

Modular home being lifted with crane.

Oregon Bill Would End Bans on Manufactured Housing

The bill would prevent new developments from prohibiting mobile homes and modular housing.

May 9 - Oregon Capital Chronicle

Two people on Nashville BCycle bike share wearing helmets loking out over railing at downtown skyline.

Nashville Doesn’t Renew Bike Share Contract, Citing Lost Federal Funding

The city’s bike share system, operated by BCycle, could stop operating if the city doesn’t find a new source of funding.

May 9 - WKRN

Urban Design for Planners 1: Software Tools

This six-course series explores essential urban design concepts using open source software and equips planners with the tools they need to participate fully in the urban design process.

Planning for Universal Design

Learn the tools for implementing Universal Design in planning regulations.